Thermal spraying is a kind of surface strengthening technology, which has always been a new technology project promoted by our country. It uses electric arc, plasma arc, gas-oxygen and other forms of heat source, the metal or non-metallic materials heated to melt or semi-molten state, and in the high-speed airflow atomized into fine droplets or high temperature particles to high Of the jet speed jet to the treated surface of the workpiece, the formation of a solid cover, so that the workpiece surface with different hardness, wear resistance, corrosion resistance, heat resistance, oxidation resistance, insulation, insulation, electrical conductivity, sealing, disinfection, anti-microwave Radiation and a variety of other special physicochemical properties. It can be repaired in the maintenance of equipment waste, so that scrapped parts “back to life”; also in the manufacture of new products to strengthen and pre-protection, so that “longevity.”